not a rant, its a problem that needs dealing with and needs discussing with him in a constructive manner, which you did. Maybe his pride was hurt but he's taken it on board. You'll see at next practice. I try to stop songs when they go wrong then explain why, and we start again. Other bands I've been in try to bluff their way through it and finish the song then forget and move on to the next. This never helps anyone grow as a musician or performer.
Has he tried playing to a click track?